Physics
Scientific paper
Nov 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979natur.282..274b&link_type=abstract
Nature, vol. 282, Nov. 15, 1979, p. 274-276.
Physics
24
Binary Stars, Stellar Mass Accretion, Stellar Spectra, Stellar Winds, Variable Stars, Main Sequence Stars, Mass Transfer, Stellar Evolution, Stellar Luminosity, Stellar Models, Stellar Temperature
Scientific paper
A model involving binary mass transfer and accretion onto main sequence stars is developed to explain the brightest known stars in external galaxies, the Hubble-Sandage variables. The similarity in spectral properties between the Hubble-Sandage variables and cataclysmic variables and the extreme disparity in their luminosities are presented as evidence for the essential similarity of the processes in the two systems on differing scales. Predictions of a steady accretion-disk model for white dwarfs scaled to calculate the variations of the maximum disk temperature and luminosity with accretion rate for main sequence stars are shown to agree with observations of Hubble-Sandage variables. Similarities in optical depth, surface density, line broadening and doubling, the Balmer jump and stellar winds are also examined. Observations of the luminosity, spectral features and nova-like explosion of eta Carina are suggested to be evidence of an accreting main sequence star in our own galaxy.
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